grannan



` 2 sheets-'sheet A1.

(No Model.)

L. GRANNAN. 'PRESSURE GUVBRNOR.

Patented NOV. 8.1881.

l l(N0 Model.) E 2 sheets-"shea 2.

` L'. GRANNAN.

- PRESSURE GOVERNOR. E No. 249,169. Patented Nov. 8,' 1881..

`, UNITED STATES PATENT ETFIOE.

LOUIs GRANNAN; on PHILADELPHIA, .PnNNs'YLvANI/A, AssIeNOR on ONE- HALF TO Tan ATLANTIO nnnrNINe COMPANY, on SAME PLACE. t

PRESSURE-GOVERNOR.

v SPECIFICATION forming part of Letters Patent No. 249,169, dated November 8, 1881.

i Application meant-ly 23,1881. (Nm'del.)

To all whom it may concern:

Be it known that I, Louis GRANNAN, of Phil- V adelphia, Pennsylvania, have invented a new device for use inconnection'with pumps and pumping apparatus generally, whereby any sudden or abnormal increasel of resistance or work is utilized to increase the supply of steam to the engine, and thus restore equilibrium between the power and the work. t

In the drawings, A is a steam feed pipe, which atB receives steam from the boiler, and at G feeds it to the engine D.

E is a plate-valve controlling the steam feedpipe,and mounted therein upon ashaft,F,jour

naled transversely through the Walls of said pipe, and adapted to be revolved by means of a pulley, G, affixed to the projecting outer extremity of said shaft, in'such manner that the supply of' steam to the engine may be regulated at will. The pulley G is provided on its edge witha groove,in which works a cord, H, one end ot' which is connected with a coiled spiral or other suitable spring, I, conveniently attached to a bracket, J, by means offa thumbscrew, K, in such manner that the tension of the spring may be regulated thereby. The other extremity of the cord termina-tes in and is attached to a two-part piston,the` two parts of which, N O, are of different diameters, and work respectively within chambers or cylinders N' O', of suitable construction, and conveniently supported from the feed-pipe.

P is a steam-passage between the feed-pipe A and the chamber N', whereby steam is admitted from the i'eed pipe below the valve to said chamber. f

Q is apipe 'extending from Qthe interior of thepump R and terminatingin t-helower chamber, O. This pipe is provided with a drip cock,

Y, and a supply-cock, X, whereby the supply 5o of steam from the pump is regulated at will.

Such being the construction of a convenient embodiment of my invention, it is to be remarked that the construction of the upper portion, N, of the piston and its operation in con- 5 5 nection with the spring in the controlling of the valve are fully set forth and claimed in and constitute the subject-matter of anapplication executed and filed by me contemporaneously with this application, and denominated by me 6o Case A.77

The operation of the second part of the piston to which I herein lay claim is as follows: Assume the cock X to be open, so that direct communication is established between the 65 pump R and the chamber O', and further assume that the pump Ris being operated to perform a given amount of work, and thatit is suddenly called upon to meet a greater or abnormal demand-such,fo r instance, as the forc- 7o ing of water for the extinguishing ot' fires.` Under these conditions thepressure in thepump is transmitted through the pipes Q to the chamber O', wherein it is exerted upon the part O of the piston to force it upward, and thereby 75 oo-operate with the spring I in overcoming the resistance of the steam upon the part Nin revolving the pulley G and in opening the valve E for the admission of more steam to the engine. The spring I is to be so adjusted that 8o the valve E stands open prior to the admission of steam to the feed-pipe A.

It is thus seenl that my invention provides a governor adapted to be automatically operated to feed an increased supply of steam tO the en- 8 5 gine Whenever a sudden or abnormal amount of work is to be performed thereby. Itis obvious -that the valve is'then subject to two opposing forces-one that of the steam in the feed pipe acting upon the upper part of the 9o piston, and the other that of the spring, assisted by that of the steam in the pump, uponl the lower part of the piston-and that under 'the uctuations or varying tensions of these forces the valve is operated.

lIt will be obvious to any mechanic that, although both convenient and simple, the wheel and cord upon the valve-shaft may be dispensed with and cranks, segmental gears, or kindred mechanical devices employed to connect the springon the one hand andthe plunger on the other With the valve. It Will be also obvious. that other mechanical equivalents for the spring may be employed in lieu thereof.

'Having thus described my invention, I-

1. In combination with avalvc controlling a steam feed-pipe, and provided with a wheel and cord or kindred valve-operating device, a spring, or its equivalent, connected with one end of said valve-cord, and a two-part pistonone part of which plays Within a chamber com municatiug With said steam feed-pipe below the valve, and is adapted to be operated upon by steam from the feed-pipe in such manner as to counteract the recoil of the spring, and the other part of which plays Within a chamber communicating with a pump, and is adapted to be operated upon by steam from the pump in such manner as to assist the. recoil ot' the spring-connected with the other end of said cord, the Whole constituting a pressure governor in which the steam supplying valve is 25 opened by the spring, assisted by steam-pressure upon that part of the piston which is in communication with the pump, closed by steampressure upon that part of the piston which is in communication with the 4feed-pipe, or held in equilibrium by the counteracting tensions ofthe forces above named, substantially as set forth.

2. In a pressure-governor, the combination of the valve E,providedwith awheel and cord or kindred valve operating device, and controlling the steam feed-pipe, the .spring I, and the piston N,operatiug within the chamber N', and the piston O, operating Within the cham'- ber O', substantially as and for the purposes set forth.

In testimony whereof I have hereunto set my hand the 4th day of April, 1881.

LOUIS GRANNAN.

Witnesses:

W. C. STRAWBRIDGE, J. BoNsALL TAYLOR. 

